sys/dev/drm2/drm_crtc_helper.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  *
   5  * DRM core CRTC related functions
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and its
   8  * documentation for any purpose is hereby granted without fee, provided that
   9  * the above copyright notice appear in all copies and that both that copyright
  10  * notice and this permission notice appear in supporting documentation, and
  11  * that the name of the copyright holders not be used in advertising or
  12  * publicity pertaining to distribution of the software without specific,
  13  * written prior permission.  The copyright holders make no representations
  14  * about the suitability of this software for any purpose.  It is provided "as
  15  * is" without express or implied warranty.
  16  *
  17  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  19  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23  * OF THIS SOFTWARE.
  24  *
  25  * Authors:
  26  *      Keith Packard
  27  *      Eric Anholt <eric@anholt.net>
  28  *      Dave Airlie <airlied@linux.ie>
  29  *      Jesse Barnes <jesse.barnes@intel.com>
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <dev/drm2/drmP.h>
  38 #include <dev/drm2/drm_crtc.h>
  39 #include <dev/drm2/drm_fourcc.h>
  40 #include <dev/drm2/drm_crtc_helper.h>
  41 #include <dev/drm2/drm_fb_helper.h>
  42
  43 bool
  44 drm_fetch_cmdline_mode_from_kenv(struct drm_connector *connector,
  45     struct drm_cmdline_mode *cmdline_mode)
  46 {
  47         char *tun_var_name, *tun_mode;
  48         static const char tun_prefix[] = "drm_mode.";
  49         bool res;
  50
  51         res = false;
  52         tun_var_name = malloc(sizeof(tun_prefix) +
  53             strlen(drm_get_connector_name(connector)), M_TEMP, M_WAITOK);
  54         strcpy(tun_var_name, tun_prefix);
  55         strcat(tun_var_name, drm_get_connector_name(connector));
  56         tun_mode = getenv(tun_var_name);
  57         if (tun_mode != NULL) {
  58                 res = drm_mode_parse_command_line_for_connector(tun_mode,
  59                     connector, cmdline_mode);
  60                 freeenv(tun_mode);
  61         }
  62         free(tun_var_name, M_TEMP);
  63         return (res);
  64 }
  65
  66 static bool drm_kms_helper_poll = true;
  67
  68 static void drm_mode_validate_flag(struct drm_connector *connector,
  69                                    int flags)
  70 {
  71         struct drm_display_mode *mode, *t;
  72
  73         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
  74                 return;
  75
  76         list_for_each_entry_safe(mode, t, &connector->modes, head) {
  77                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
  78                                 !(flags & DRM_MODE_FLAG_INTERLACE))
  79                         mode->status = MODE_NO_INTERLACE;
  80                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
  81                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
  82                         mode->status = MODE_NO_DBLESCAN;
  83         }
  84
  85         return;
  86 }
  87
  88 /**
  89  * drm_helper_probe_single_connector_modes - get complete set of display modes
  90  * @dev: DRM device
  91  * @maxX: max width for modes
  92  * @maxY: max height for modes
  93  *
  94  * LOCKING:
  95  * Caller must hold mode config lock.
  96  *
  97  * Based on @dev's mode_config layout, scan all the connectors and try to detect
  98  * modes on them.  Modes will first be added to the connector's probed_modes
  99  * list, then culled (based on validity and the @maxX, @maxY parameters) and
 100  * put into the normal modes list.
 101  *
 102  * Intended to be used either at bootup time or when major configuration
 103  * changes have occurred.
 104  *
 105  * FIXME: take into account monitor limits
 106  *
 107  * RETURNS:
 108  * Number of modes found on @connector.
 109  */
 110 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 111                                             uint32_t maxX, uint32_t maxY)
 112 {
 113         struct drm_device *dev = connector->dev;
 114         struct drm_display_mode *mode, *t;
 115         struct drm_connector_helper_funcs *connector_funcs =
 116                 connector->helper_private;
 117         struct drm_cmdline_mode cmdline_mode;
 118         int count = 0;
 119         int mode_flags = 0;
 120
 121         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
 122                         drm_get_connector_name(connector));
 123         /* set all modes to the unverified state */
 124         list_for_each_entry_safe(mode, t, &connector->modes, head)
 125                 mode->status = MODE_UNVERIFIED;
 126
 127         if (connector->force) {
 128                 if (connector->force == DRM_FORCE_ON)
 129                         connector->status = connector_status_connected;
 130                 else
 131                         connector->status = connector_status_disconnected;
 132                 if (connector->funcs->force)
 133                         connector->funcs->force(connector);
 134         } else {
 135                 connector->status = connector->funcs->detect(connector, true);
 136                 drm_kms_helper_poll_enable(dev);
 137         }
 138
 139         if (connector->status == connector_status_disconnected) {
 140                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
 141                         connector->base.id, drm_get_connector_name(connector));
 142                 drm_mode_connector_update_edid_property(connector, NULL);
 143                 goto prune;
 144         }
 145
 146         count = (*connector_funcs->get_modes)(connector);
 147         if (count == 0 && drm_fetch_cmdline_mode_from_kenv(connector,
 148             &cmdline_mode)) {
 149                 mode = drm_mode_create_from_cmdline_mode(dev,
 150                     &cmdline_mode);
 151                 if (mode != NULL) {
 152                         DRM_DEBUG_KMS(
 153         "[CONNECTOR:%d:%s] found manual override ",
 154                             connector->base.id,
 155                             drm_get_connector_name(connector));
 156                         drm_mode_debug_printmodeline(mode);
 157                         drm_mode_probed_add(connector, mode);
 158                         count++;
 159                 } else {
 160                         DRM_ERROR(
 161         "[CONNECTOR:%d:%s] manual override mode: parse error\n",
 162                             connector->base.id,
 163                             drm_get_connector_name(connector));
 164                 }
 165         }
 166         if (count == 0 && connector->status == connector_status_connected)
 167                 count = drm_add_modes_noedid(connector, 1024, 768);
 168         if (count == 0)
 169                 goto prune;
 170
 171         drm_mode_connector_list_update(connector);
 172
 173         if (maxX && maxY)
 174                 drm_mode_validate_size(dev, &connector->modes, maxX,
 175                                        maxY, 0);
 176
 177         if (connector->interlace_allowed)
 178                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
 179         if (connector->doublescan_allowed)
 180                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
 181         drm_mode_validate_flag(connector, mode_flags);
 182
 183         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 184                 if (mode->status == MODE_OK)
 185                         mode->status = connector_funcs->mode_valid(connector,
 186                                                                    mode);
 187         }
 188
 189 prune:
 190         drm_mode_prune_invalid(dev, &connector->modes, true);
 191
 192         if (list_empty(&connector->modes))
 193                 return 0;
 194
 195         drm_mode_sort(&connector->modes);
 196
 197         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 198                         drm_get_connector_name(connector));
 199         list_for_each_entry_safe(mode, t, &connector->modes, head) {
 200                 mode->vrefresh = drm_mode_vrefresh(mode);
 201
 202                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 203                 drm_mode_debug_printmodeline(mode);
 204         }
 205
 206         return count;
 207 }
 208
 209 /**
 210  * drm_helper_encoder_in_use - check if a given encoder is in use
 211  * @encoder: encoder to check
 212  *
 213  * LOCKING:
 214  * Caller must hold mode config lock.
 215  *
 216  * Walk @encoders's DRM device's mode_config and see if it's in use.
 217  *
 218  * RETURNS:
 219  * True if @encoder is part of the mode_config, false otherwise.
 220  */
 221 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
 222 {
 223         struct drm_connector *connector;
 224         struct drm_device *dev = encoder->dev;
 225         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 226                 if (connector->encoder == encoder)
 227                         return true;
 228         return false;
 229 }
 230
 231 /**
 232  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 233  * @crtc: CRTC to check
 234  *
 235  * LOCKING:
 236  * Caller must hold mode config lock.
 237  *
 238  * Walk @crtc's DRM device's mode_config and see if it's in use.
 239  *
 240  * RETURNS:
 241  * True if @crtc is part of the mode_config, false otherwise.
 242  */
 243 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
 244 {
 245         struct drm_encoder *encoder;
 246         struct drm_device *dev = crtc->dev;
 247         /* FIXME: Locking around list access? */
 248         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 249                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
 250                         return true;
 251         return false;
 252 }
 253
 254 static void
 255 drm_encoder_disable(struct drm_encoder *encoder)
 256 {
 257         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 258
 259         if (encoder_funcs->disable)
 260                 (*encoder_funcs->disable)(encoder);
 261         else
 262                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 263 }
 264
 265 /**
 266  * drm_helper_disable_unused_functions - disable unused objects
 267  * @dev: DRM device
 268  *
 269  * LOCKING:
 270  * Caller must hold mode config lock.
 271  *
 272  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 273  * by calling its dpms function, which should power it off.
 274  */
 275 void drm_helper_disable_unused_functions(struct drm_device *dev)
 276 {
 277         struct drm_encoder *encoder;
 278         struct drm_connector *connector;
 279         struct drm_crtc *crtc;
 280
 281         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 282                 if (!connector->encoder)
 283                         continue;
 284                 if (connector->status == connector_status_disconnected)
 285                         connector->encoder = NULL;
 286         }
 287
 288         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 289                 if (!drm_helper_encoder_in_use(encoder)) {
 290                         drm_encoder_disable(encoder);
 291                         /* disconnector encoder from any connector */
 292                         encoder->crtc = NULL;
 293                 }
 294         }
 295
 296         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 297                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 298                 crtc->enabled = drm_helper_crtc_in_use(crtc);
 299                 if (!crtc->enabled) {
 300                         if (crtc_funcs->disable)
 301                                 (*crtc_funcs->disable)(crtc);
 302                         else
 303                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
 304                         crtc->fb = NULL;
 305                 }
 306         }
 307 }
 308
 309 /**
 310  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 311  * @encoder: encoder to test
 312  * @crtc: crtc to test
 313  *
 314  * Return false if @encoder can't be driven by @crtc, true otherwise.
 315  */
 316 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 317                                 struct drm_crtc *crtc)
 318 {
 319         struct drm_device *dev;
 320         struct drm_crtc *tmp;
 321         int crtc_mask = 1;
 322
 323         if (crtc == NULL)
 324                 printf("checking null crtc?\n");
 325
 326         dev = crtc->dev;
 327
 328         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
 329                 if (tmp == crtc)
 330                         break;
 331                 crtc_mask <<= 1;
 332         }
 333
 334         if (encoder->possible_crtcs & crtc_mask)
 335                 return true;
 336         return false;
 337 }
 338
 339 /*
 340  * Check the CRTC we're going to map each output to vs. its current
 341  * CRTC.  If they don't match, we have to disable the output and the CRTC
 342  * since the driver will have to re-route things.
 343  */
 344 static void
 345 drm_crtc_prepare_encoders(struct drm_device *dev)
 346 {
 347         struct drm_encoder_helper_funcs *encoder_funcs;
 348         struct drm_encoder *encoder;
 349
 350         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 351                 encoder_funcs = encoder->helper_private;
 352                 /* Disable unused encoders */
 353                 if (encoder->crtc == NULL)
 354                         drm_encoder_disable(encoder);
 355                 /* Disable encoders whose CRTC is about to change */
 356                 if (encoder_funcs->get_crtc &&
 357                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
 358                         drm_encoder_disable(encoder);
 359         }
 360 }
 361
 362 /**
 363  * drm_crtc_set_mode - set a mode
 364  * @crtc: CRTC to program
 365  * @mode: mode to use
 366  * @x: width of mode
 367  * @y: height of mode
 368  *
 369  * LOCKING:
 370  * Caller must hold mode config lock.
 371  *
 372  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
 373  * to fixup or reject the mode prior to trying to set it.
 374  *
 375  * RETURNS:
 376  * True if the mode was set successfully, or false otherwise.
 377  */
 378 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 379                               struct drm_display_mode *mode,
 380                               int x, int y,
 381                               struct drm_framebuffer *old_fb)
 382 {
 383         struct drm_device *dev = crtc->dev;
 384         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 385         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 386         struct drm_encoder_helper_funcs *encoder_funcs;
 387         int saved_x, saved_y;
 388         struct drm_encoder *encoder;
 389         bool ret = true;
 390
 391         crtc->enabled = drm_helper_crtc_in_use(crtc);
 392         if (!crtc->enabled)
 393                 return true;
 394
 395         adjusted_mode = drm_mode_duplicate(dev, mode);
 396         if (!adjusted_mode)
 397                 return false;
 398
 399         saved_hwmode = crtc->hwmode;
 400         saved_mode = crtc->mode;
 401         saved_x = crtc->x;
 402         saved_y = crtc->y;
 403
 404         /* Update crtc values up front so the driver can rely on them for mode
 405          * setting.
 406          */
 407         crtc->mode = *mode;
 408         crtc->x = x;
 409         crtc->y = y;
 410
 411         /* Pass our mode to the connectors and the CRTC to give them a chance to
 412          * adjust it according to limitations or connector properties, and also
 413          * a chance to reject the mode entirely.
 414          */
 415         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 416
 417                 if (encoder->crtc != crtc)
 418                         continue;
 419                 encoder_funcs = encoder->helper_private;
 420                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
 421                                                       adjusted_mode))) {
 422                         goto done;
 423                 }
 424         }
 425
 426         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
 427                 goto done;
 428         }
 429         DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 430
 431         /* Prepare the encoders and CRTCs before setting the mode. */
 432         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 433
 434                 if (encoder->crtc != crtc)
 435                         continue;
 436                 encoder_funcs = encoder->helper_private;
 437                 /* Disable the encoders as the first thing we do. */
 438                 encoder_funcs->prepare(encoder);
 439         }
 440
 441         drm_crtc_prepare_encoders(dev);
 442
 443         crtc_funcs->prepare(crtc);
 444
 445         /* Set up the DPLL and any encoders state that needs to adjust or depend
 446          * on the DPLL.
 447          */
 448         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 449         if (!ret)
 450             goto done;
 451
 452         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 453
 454                 if (encoder->crtc != crtc)
 455                         continue;
 456
 457                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 458                         encoder->base.id, drm_get_encoder_name(encoder),
 459                         mode->base.id, mode->name);
 460                 encoder_funcs = encoder->helper_private;
 461                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 462         }
 463
 464         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
 465         crtc_funcs->commit(crtc);
 466
 467         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 468
 469                 if (encoder->crtc != crtc)
 470                         continue;
 471
 472                 encoder_funcs = encoder->helper_private;
 473                 encoder_funcs->commit(encoder);
 474
 475         }
 476
 477         /* Store real post-adjustment hardware mode. */
 478         crtc->hwmode = *adjusted_mode;
 479
 480         /* Calculate and store various constants which
 481          * are later needed by vblank and swap-completion
 482          * timestamping. They are derived from true hwmode.
 483          */
 484         drm_calc_timestamping_constants(crtc);
 485
 486         /* FIXME: add subpixel order */
 487 done:
 488         drm_mode_destroy(dev, adjusted_mode);
 489         if (!ret) {
 490                 crtc->hwmode = saved_hwmode;
 491                 crtc->mode = saved_mode;
 492                 crtc->x = saved_x;
 493                 crtc->y = saved_y;
 494         }
 495
 496         return ret;
 497 }
 498
 499 static int
 500 drm_crtc_helper_disable(struct drm_crtc *crtc)
 501 {
 502         struct drm_device *dev = crtc->dev;
 503         struct drm_connector *connector;
 504         struct drm_encoder *encoder;
 505
 506         /* Decouple all encoders and their attached connectors from this crtc */
 507         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 508                 if (encoder->crtc != crtc)
 509                         continue;
 510
 511                 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 512                         if (connector->encoder != encoder)
 513                                 continue;
 514
 515                         connector->encoder = NULL;
 516                 }
 517         }
 518
 519         drm_helper_disable_unused_functions(dev);
 520         return 0;
 521 }
 522
 523 /**
 524  * drm_crtc_helper_set_config - set a new config from userspace
 525  * @crtc: CRTC to setup
 526  * @crtc_info: user provided configuration
 527  * @new_mode: new mode to set
 528  * @connector_set: set of connectors for the new config
 529  * @fb: new framebuffer
 530  *
 531  * LOCKING:
 532  * Caller must hold mode config lock.
 533  *
 534  * Setup a new configuration, provided by the user in @crtc_info, and enable
 535  * it.
 536  *
 537  * RETURNS:
 538  * Zero. (FIXME)
 539  */
 540 int drm_crtc_helper_set_config(struct drm_mode_set *set)
 541 {
 542         struct drm_device *dev;
 543         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
 544         struct drm_encoder *save_encoders, *new_encoder, *encoder;
 545         struct drm_framebuffer *old_fb = NULL;
 546         bool mode_changed = false; /* if true do a full mode set */
 547         bool fb_changed = false; /* if true and !mode_changed just do a flip */
 548         struct drm_connector *save_connectors, *connector;
 549         int count = 0, ro, fail = 0;
 550         struct drm_crtc_helper_funcs *crtc_funcs;
 551         struct drm_mode_set save_set;
 552         int ret = 0;
 553         int i;
 554
 555         DRM_DEBUG_KMS("\n");
 556
 557         if (!set)
 558                 return -EINVAL;
 559
 560         if (!set->crtc)
 561                 return -EINVAL;
 562
 563         if (!set->crtc->helper_private)
 564                 return -EINVAL;
 565
 566         crtc_funcs = set->crtc->helper_private;
 567
 568         if (!set->mode)
 569                 set->fb = NULL;
 570
 571         if (set->fb) {
 572                 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
 573                                 set->crtc->base.id, set->fb->base.id,
 574                                 (int)set->num_connectors, set->x, set->y);
 575         } else {
 576                 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
 577                 return drm_crtc_helper_disable(set->crtc);
 578         }
 579
 580         dev = set->crtc->dev;
 581
 582         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
 583          * connector data. */
 584         save_crtcs = malloc(dev->mode_config.num_crtc * sizeof(struct drm_crtc),
 585             DRM_MEM_KMS, M_WAITOK | M_ZERO);
 586         save_encoders = malloc(dev->mode_config.num_encoder *
 587             sizeof(struct drm_encoder), DRM_MEM_KMS, M_WAITOK | M_ZERO);
 588         save_connectors = malloc(dev->mode_config.num_connector *
 589             sizeof(struct drm_connector), DRM_MEM_KMS, M_WAITOK | M_ZERO);
 590
 591         /* Copy data. Note that driver private data is not affected.
 592          * Should anything bad happen only the expected state is
 593          * restored, not the drivers personal bookkeeping.
 594          */
 595         count = 0;
 596         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 597                 save_crtcs[count++] = *crtc;
 598         }
 599
 600         count = 0;
 601         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 602                 save_encoders[count++] = *encoder;
 603         }
 604
 605         count = 0;
 606         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 607                 save_connectors[count++] = *connector;
 608         }
 609
 610         save_set.crtc = set->crtc;
 611         save_set.mode = &set->crtc->mode;
 612         save_set.x = set->crtc->x;
 613         save_set.y = set->crtc->y;
 614         save_set.fb = set->crtc->fb;
 615
 616         /* We should be able to check here if the fb has the same properties
 617          * and then just flip_or_move it */
 618         if (set->crtc->fb != set->fb) {
 619                 /* If we have no fb then treat it as a full mode set */
 620                 if (set->crtc->fb == NULL) {
 621                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 622                         mode_changed = true;
 623                 } else if (set->fb == NULL) {
 624                         mode_changed = true;
 625                 } else
 626                         fb_changed = true;
 627         }
 628
 629         if (set->x != set->crtc->x || set->y != set->crtc->y)
 630                 fb_changed = true;
 631
 632         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
 633                 DRM_DEBUG_KMS("modes are different, full mode set\n");
 634                 drm_mode_debug_printmodeline(&set->crtc->mode);
 635                 drm_mode_debug_printmodeline(set->mode);
 636                 mode_changed = true;
 637         }
 638
 639         /* a) traverse passed in connector list and get encoders for them */
 640         count = 0;
 641         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 642                 struct drm_connector_helper_funcs *connector_funcs =
 643                         connector->helper_private;
 644                 new_encoder = connector->encoder;
 645                 for (ro = 0; ro < set->num_connectors; ro++) {
 646                         if (set->connectors[ro] == connector) {
 647                                 new_encoder = connector_funcs->best_encoder(connector);
 648                                 /* if we can't get an encoder for a connector
 649                                    we are setting now - then fail */
 650                                 if (new_encoder == NULL)
 651                                         /* don't break so fail path works correct */
 652                                         fail = 1;
 653                                 break;
 654                         }
 655                 }
 656
 657                 if (new_encoder != connector->encoder) {
 658                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
 659                         mode_changed = true;
 660                         /* If the encoder is reused for another connector, then
 661                          * the appropriate crtc will be set later.
 662                          */
 663                         if (connector->encoder)
 664                                 connector->encoder->crtc = NULL;
 665                         connector->encoder = new_encoder;
 666                 }
 667         }
 668
 669         if (fail) {
 670                 ret = -EINVAL;
 671                 goto fail;
 672         }
 673
 674         count = 0;
 675         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 676                 if (!connector->encoder)
 677                         continue;
 678
 679                 if (connector->encoder->crtc == set->crtc)
 680                         new_crtc = NULL;
 681                 else
 682                         new_crtc = connector->encoder->crtc;
 683
 684                 for (ro = 0; ro < set->num_connectors; ro++) {
 685                         if (set->connectors[ro] == connector)
 686                                 new_crtc = set->crtc;
 687                 }
 688
 689                 /* Make sure the new CRTC will work with the encoder */
 690                 if (new_crtc &&
 691                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
 692                         ret = -EINVAL;
 693                         goto fail;
 694                 }
 695                 if (new_crtc != connector->encoder->crtc) {
 696                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
 697                         mode_changed = true;
 698                         connector->encoder->crtc = new_crtc;
 699                 }
 700                 if (new_crtc) {
 701                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
 702                                 connector->base.id, drm_get_connector_name(connector),
 703                                 new_crtc->base.id);
 704                 } else {
 705                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
 706                                 connector->base.id, drm_get_connector_name(connector));
 707                 }
 708         }
 709
 710         /* mode_set_base is not a required function */
 711         if (fb_changed && !crtc_funcs->mode_set_base)
 712                 mode_changed = true;
 713
 714         if (mode_changed) {
 715                 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
 716                 if (set->crtc->enabled) {
 717                         DRM_DEBUG_KMS("attempting to set mode from"
 718                                         " userspace\n");
 719                         drm_mode_debug_printmodeline(set->mode);
 720                         old_fb = set->crtc->fb;
 721                         set->crtc->fb = set->fb;
 722                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
 723                                                       set->x, set->y,
 724                                                       old_fb)) {
 725                                 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
 726                                           set->crtc->base.id);
 727                                 set->crtc->fb = old_fb;
 728                                 ret = -EINVAL;
 729                                 goto fail;
 730                         }
 731                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
 732                         for (i = 0; i < set->num_connectors; i++) {
 733                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
 734                                               drm_get_connector_name(set->connectors[i]));
 735                                 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
 736                         }
 737                 }
 738                 drm_helper_disable_unused_functions(dev);
 739         } else if (fb_changed) {
 740                 set->crtc->x = set->x;
 741                 set->crtc->y = set->y;
 742
 743                 old_fb = set->crtc->fb;
 744                 if (set->crtc->fb != set->fb)
 745                         set->crtc->fb = set->fb;
 746                 ret = crtc_funcs->mode_set_base(set->crtc,
 747                                                 set->x, set->y, old_fb);
 748                 if (ret != 0) {
 749                         set->crtc->fb = old_fb;
 750                         goto fail;
 751                 }
 752         }
 753
 754         free(save_connectors, DRM_MEM_KMS);
 755         free(save_encoders, DRM_MEM_KMS);
 756         free(save_crtcs, DRM_MEM_KMS);
 757         return 0;
 758
 759 fail:
 760         /* Restore all previous data. */
 761         count = 0;
 762         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 763                 *crtc = save_crtcs[count++];
 764         }
 765
 766         count = 0;
 767         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 768                 *encoder = save_encoders[count++];
 769         }
 770
 771         count = 0;
 772         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 773                 *connector = save_connectors[count++];
 774         }
 775
 776         /* Try to restore the config */
 777         if (mode_changed &&
 778             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
 779                                       save_set.y, save_set.fb))
 780                 DRM_ERROR("failed to restore config after modeset failure\n");
 781
 782         free(save_connectors, DRM_MEM_KMS);
 783         free(save_encoders, DRM_MEM_KMS);
 784         free(save_crtcs, DRM_MEM_KMS);
 785         return ret;
 786 }
 787
 788 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 789 {
 790         int dpms = DRM_MODE_DPMS_OFF;
 791         struct drm_connector *connector;
 792         struct drm_device *dev = encoder->dev;
 793
 794         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 795                 if (connector->encoder == encoder)
 796                         if (connector->dpms < dpms)
 797                                 dpms = connector->dpms;
 798         return dpms;
 799 }
 800
 801 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
 802 {
 803         int dpms = DRM_MODE_DPMS_OFF;
 804         struct drm_connector *connector;
 805         struct drm_device *dev = crtc->dev;
 806
 807         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 808                 if (connector->encoder && connector->encoder->crtc == crtc)
 809                         if (connector->dpms < dpms)
 810                                 dpms = connector->dpms;
 811         return dpms;
 812 }
 813
 814 /**
 815  * drm_helper_connector_dpms
 816  * @connector affected connector
 817  * @mode DPMS mode
 818  *
 819  * Calls the low-level connector DPMS function, then
 820  * calls appropriate encoder and crtc DPMS functions as well
 821  */
 822 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
 823 {
 824         struct drm_encoder *encoder = connector->encoder;
 825         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 826         int old_dpms;
 827
 828         if (mode == connector->dpms)
 829                 return;
 830
 831         old_dpms = connector->dpms;
 832         connector->dpms = mode;
 833
 834         /* from off to on, do crtc then encoder */
 835         if (mode < old_dpms) {
 836                 if (crtc) {
 837                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 838                         if (crtc_funcs->dpms)
 839                                 (*crtc_funcs->dpms) (crtc,
 840                                                      drm_helper_choose_crtc_dpms(crtc));
 841                 }
 842                 if (encoder) {
 843                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 844                         if (encoder_funcs->dpms)
 845                                 (*encoder_funcs->dpms) (encoder,
 846                                                         drm_helper_choose_encoder_dpms(encoder));
 847                 }
 848         }
 849
 850         /* from on to off, do encoder then crtc */
 851         if (mode > old_dpms) {
 852                 if (encoder) {
 853                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 854                         if (encoder_funcs->dpms)
 855                                 (*encoder_funcs->dpms) (encoder,
 856                                                         drm_helper_choose_encoder_dpms(encoder));
 857                 }
 858                 if (crtc) {
 859                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 860                         if (crtc_funcs->dpms)
 861                                 (*crtc_funcs->dpms) (crtc,
 862                                                      drm_helper_choose_crtc_dpms(crtc));
 863                 }
 864         }
 865
 866         return;
 867 }
 868
 869 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
 870                                    struct drm_mode_fb_cmd2 *mode_cmd)
 871 {
 872         int i;
 873
 874         fb->width = mode_cmd->width;
 875         fb->height = mode_cmd->height;
 876         for (i = 0; i < 4; i++) {
 877                 fb->pitches[i] = mode_cmd->pitches[i];
 878                 fb->offsets[i] = mode_cmd->offsets[i];
 879         }
 880         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
 881                                     &fb->bits_per_pixel);
 882         fb->pixel_format = mode_cmd->pixel_format;
 883
 884         return 0;
 885 }
 886
 887 int drm_helper_resume_force_mode(struct drm_device *dev)
 888 {
 889         struct drm_crtc *crtc;
 890         struct drm_encoder *encoder;
 891         struct drm_encoder_helper_funcs *encoder_funcs;
 892         struct drm_crtc_helper_funcs *crtc_funcs;
 893         int ret;
 894
 895         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 896
 897                 if (!crtc->enabled)
 898                         continue;
 899
 900                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
 901                                                crtc->x, crtc->y, crtc->fb);
 902
 903                 if (!ret)
 904                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
 905
 906                 /* Turn off outputs that were already powered off */
 907                 if (drm_helper_choose_crtc_dpms(crtc)) {
 908                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 909
 910                                 if(encoder->crtc != crtc)
 911                                         continue;
 912
 913                                 encoder_funcs = encoder->helper_private;
 914                                 if (encoder_funcs->dpms)
 915                                         (*encoder_funcs->dpms) (encoder,
 916                                             drm_helper_choose_encoder_dpms(encoder));
 917                         }
 918
 919                         crtc_funcs = crtc->helper_private;
 920                         if (crtc_funcs->dpms)
 921                                 (*crtc_funcs->dpms) (crtc,
 922                                     drm_helper_choose_crtc_dpms(crtc));
 923                 }
 924         }
 925         /* disable the unused connectors while restoring the modesetting */
 926         drm_helper_disable_unused_functions(dev);
 927         return 0;
 928 }
 929
 930 #define DRM_OUTPUT_POLL_PERIOD (10 * hz)
 931 static void output_poll_execute(void *ctx, int pending)
 932 {
 933         struct drm_device *dev;
 934         struct drm_connector *connector;
 935         enum drm_connector_status old_status;
 936         bool repoll = false, changed = false;
 937
 938         if (!drm_kms_helper_poll)
 939                 return;
 940
 941         dev = ctx;
 942
 943         sx_xlock(&dev->mode_config.mutex);
 944         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 945
 946                 /* if this is HPD or polled don't check it -
 947                    TV out for instance */
 948                 if (!connector->polled)
 949                         continue;
 950
 951                 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
 952                     DRM_CONNECTOR_POLL_DISCONNECT))
 953                         repoll = true;
 954
 955                 old_status = connector->status;
 956                 /* if we are connected and don't want to poll for disconnect
 957                    skip it */
 958                 if (old_status == connector_status_connected &&
 959                     !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
 960                     !(connector->polled & DRM_CONNECTOR_POLL_HPD))
 961                         continue;
 962
 963                 connector->status = connector->funcs->detect(connector, false);
 964                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
 965                               connector->base.id,
 966                               drm_get_connector_name(connector),
 967                               old_status, connector->status);
 968                 if (old_status != connector->status)
 969                         changed = true;
 970         }
 971
 972         sx_xunlock(&dev->mode_config.mutex);
 973
 974         if (changed) {
 975 #if 0
 976                 /* send a uevent + call fbdev */
 977                 drm_sysfs_hotplug_event(dev);
 978 #endif
 979                 if (dev->mode_config.funcs->output_poll_changed)
 980                         dev->mode_config.funcs->output_poll_changed(dev);
 981         }
 982
 983         if (repoll) {
 984                 taskqueue_enqueue_timeout(taskqueue_thread,
 985                     &dev->mode_config.output_poll_task,
 986                     DRM_OUTPUT_POLL_PERIOD);
 987         }
 988 }
 989
 990 void drm_kms_helper_poll_disable(struct drm_device *dev)
 991 {
 992         if (!dev->mode_config.poll_enabled)
 993                 return;
 994         taskqueue_cancel_timeout(taskqueue_thread,
 995             &dev->mode_config.output_poll_task, NULL);
 996 }
 997
 998 void drm_kms_helper_poll_enable(struct drm_device *dev)
 999 {
1000         bool poll = false;
1001         struct drm_connector *connector;
1002
1003         if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1004                 return;
1005
1006         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1007                 if (connector->polled)
1008                         poll = true;
1009         }
1010
1011         if (poll) {
1012                 taskqueue_enqueue_timeout(taskqueue_thread,
1013                     &dev->mode_config.output_poll_task, DRM_OUTPUT_POLL_PERIOD);
1014         }
1015 }
1016
1017 void drm_kms_helper_poll_init(struct drm_device *dev)
1018 {
1019
1020         TIMEOUT_TASK_INIT(taskqueue_thread, &dev->mode_config.output_poll_task,
1021             0, output_poll_execute, dev);
1022         dev->mode_config.poll_enabled = true;
1023
1024         drm_kms_helper_poll_enable(dev);
1025 }
1026
1027 void drm_kms_helper_poll_fini(struct drm_device *dev)
1028 {
1029         drm_kms_helper_poll_disable(dev);
1030 }
1031
1032 void drm_helper_hpd_irq_event(struct drm_device *dev)
1033 {
1034         if (!dev->mode_config.poll_enabled)
1035                 return;
1036
1037         /* kill timer and schedule immediate execution, this doesn't block */
1038         taskqueue_cancel_timeout(taskqueue_thread,
1039             &dev->mode_config.output_poll_task, NULL);
1040         if (drm_kms_helper_poll)
1041                 taskqueue_enqueue_timeout(taskqueue_thread,
1042                     &dev->mode_config.output_poll_task, 0);
1043 }